hydrogen cloud
1hydrogen cloud — ▪ astronomy also spelled H I region or H i region in astronomy, interstellar matter composed of neutral hydrogen atoms. Most of the matter between the stars in the Milky Way Galaxy, to which the Earth belongs, as well as in other spiral …
2Hydrogen cyanide — IUPAC name …
3Cloud chamber — with visible tracks from ionizing radiation (short, thick: α particles; long, thin: β particles). See also Animated Version Video of a Cloud chamber in action The cloud chamber, a …
4Hydrogen bond — A hydrogen bond results from a dipole dipole force between an electronegative atom and a hydrogen atom bonded to nitrogen, oxygen or fluorine (thus the name hydrogen bond , which must not be confused with a covalent bond to hydrogen). The energy… …
5Noctilucent cloud — Polar mesospheric cloud Noctilucent clouds over Kuresoo bog, Viljandimaa, Estonia Abbreviation NLC/PMC Altitude …
6Molecular cloud — See also: Solar nebula Within a few million years the light from bright stars will have boiled away this molecular cloud of gas and dust. The cloud has broken off from the Carina Nebula. Newly formed stars are visible nearby, their images… …
7Mushroom cloud — created by smoke billows Ascending cloud from Redoubt Vol …
8Smith's Cloud — is a high velocity cloud of hydrogen gas located in the constellation Aquila at Galactic coordinates l = 39°, b = −13°. The cloud was discovered in 1963 by Gail Bieger, née Smith, who was an astronomy student at Leiden University in the… …
9Interstellar cloud — is the generic name given to an accumulation of gas, plasma and dust in our and other galaxies. Put differently, an interstellar cloud is a denser than average region of the interstellar medium. Depending on the density, size and temperature of a …
10Oort cloud — An artist s rendering of the Oort cloud and the Kuiper belt (inset). Sizes of individual objects have been exaggerated for visibility …
